(19)
(11) EP 0 409 443 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
14.10.1992 Bulletin 1992/42

(43) Date of publication A2:
23.01.1991 Bulletin 1991/04

(21) Application number: 90307258.5

(22) Date of filing: 03.07.1990
(51) International Patent Classification (IPC)5: A24D 3/02, A24C 5/34
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IT LI NL SE

(30) Priority: 20.07.1989 GB 8916589

(60) Divisional application:
94203407.5 / 0643927
94203408.3 / 0642746

(71) Applicant: INTERTABA S.p.A.
I-40069 Zola Predosa, Bologna (IT)

(72) Inventors:
  • Bondanelli, Luigi
    I-40069 Zola Predosa, Bologna (IT)
  • Sirani, Mauro
    I-40055 Castenaso (IT)
  • Schembri, Alfonso
    I-40050 Monteveglio (IT)
  • Boido, Dante
    I-40135 Bologna (IT)

(74) Representative: Lloyd, Patrick Alexander Desmond et al
Reddie & Grose 16 Theobalds Road
London WC1X 8PL
London WC1X 8PL (GB)


(56) References cited: : 
   
       


    (54) Control process and apparatus for the production of cigarette filters


    (57) To improve quality control a cigarette filter manufacturing line is provided with a testing station (28) which periodically removes a filter to test the diameter (at 34) and resistance to draw (at 33). The mean diameter and RTD of a number of filters is calculated (at 36) and compared to acceptable ranges. Adjustments are made to the manufacturing line to correct any unacceptable values according to a set of priorities dependent on the degree and sense of the inaccuracies.







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